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Dynamics and Control of Geostationary Satellite in GTO orbit During LAM Firing

Paeinshahri, Hamid | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46999 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Meghdari, Ali; Nejat Pishkenari, Hossein
  7. Abstract:
  8. In this study, chapter 1 is dedicated to GEO satellites. In chapter 2, slosh dynamics of fluid and its governing dynamical equations are investigated due to the importance of this phenomena in geostationary transfer orbit. In chapter 3, dynamics of satellite orbit and satellite attitude are investigated and governing equations are derived by considering these effects: orbital noise (e.g. shape of earth, gravitation of sun and moon), moment noise (e.g. slosh dynamics of fuel and oxidizer, and liquid apogee motor misalignment). Following the third chapter, some simulations are carried out before the implementation of controllers. In chapter 4, a PID controller and a classical fuzzy controller are employd to control the satellite, and results are illustrated accordingly. Besides, to model dynamics of thrusters, on-off moment control profile are applied within 0.2 second time interval and 10 Newton thrusters force. Next, different controllers are compared with each other according to eulerint, settling time, overshoot value and time, and error. These parameters are, also, tabulated. In chapter 5, a quick review of design process is provided, and it is concluded that for two special case PID controller is the best. On the other hand, in general, classical fuzzy controller have the best performance
  9. Keywords:
  10. Proportional-Integral-Derivative (PID)Controller ; Fuzzy Controller ; Satellite Attitude Control ; Classical Control ; Geostationary Satellite ; Geostationary Transfer Orbit ; Slosh Dynamics

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